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. 2020 Aug 3;37(8):160. doi: 10.1007/s11095-020-02881-1

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© The Author(s) 2020

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Fig. 6 — The number of hydrogen bonds between DOX and (a) SWCNTs and (b) graphene versus time at neutral pH; The number of hydrogen bonds between DOX and (c) SWCNTs and (d) graphene versus time at acidic pH.